Mending film is designed specifically for buried or overhead steel pipes welded joints the anticorrosive complement hurt insulated pipeline resistant insulation Mending radiation cross-linked polyethylene anticorrosive cladding material. By radiation cross-linked polyolefin substrates and special sealing hot melt adhesive coating made of composite, the special sealing hot melt adhesive with polyethylene substrate steel surface and solid epoxy coating can form a good bond. This product in the construction of heating and melting the adhesive layer, paste the damaged pipeline surface, with the original pipeline coatings form a continuous, close preservative system can resist soil stress, anti-hydrostatic pressure, resistance to cathodic disbondment, anti-chemical rot arrowhead erosion and mold erosion variety of corrosion behavior. Base material performance requirements of performance indicators Performance Indicators No. Item 1 Tensile strength (MΡa) ≥ 17 2 fracture elongation rate (%) ≥ 400 Vicat softening point (° C) ≥ 90 4 embrittlement temperature (℃) ≤ -65 5 electric strength (MV / m) ≥ 25 6 volume resistivity (Ω · m) ≥ 1 × 1013 7 resistance to environmental stress cracking (F50) (h) ≥ 1000 8 chemical corrosion resistance (soak for 7 days) (%) 10 % HCl 10% NaCl 10% NaOH ≥ 85 ≥ 85 ≥ 85 9 heat aging (150 ℃, 168 h) Tensile strength (MPa) the fracture elongation rate (%) ≥ 14 ≥ 300 glue performance indicators 10 peel strength (N / cm) contraction bands / primer 23 ° C ± 2 ° C ≥ 50 ° C 70 ± 2 ° C ≥ 15 contraction bands / polyethylene layer 23 ° C ± 2 ° C ≥ 50 ° C 70 ± 2 ° C ≥ 15 contraction band / steel 23 ° C ± 2 ℃ ≥ 70 50 ℃ ± 2 ℃ ≥ 15 11 plastic softening point (° C) ≥ 90 12 lap the the shearing intensity (MΡa) ≥ 1.0 13 plastic brittle transition temperature (℃) ≤ -15